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  <div>独占一行</div>
  <div>独占一行</div>
  <span>单行排列</span>
  <span>单行排列</span>
  <a href="#">超链接</a>
  <a href="http://baidu.com">打开华为</a>
  <a href="http://itheima.com" target="_blank">打开黑马-新页面</a>
  <a href="mailto:2642318125@qq.com">发送邮件</a>
  <a href="tel:1008611">打电话</a>
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